Spray synthetic resin paint with compressed air

In many cases, the spraying of synthetic resin paint offers an optimal painting result. Especially with curved, rounded and spatially shaped workpieces such as body parts a uniform paint job is easier to achieve. Condition is the right liquefaction.

One- and two-component coatings

For smaller workpieces, color sprays are available in which by means of a propellant, a one-component lacquer emerges as a finished product. For larger components and surfaces, a compressed air spray gun should be used.

Two-component paints are recommended here, since the viscosity or the liquid level must be adjusted anyway during mixing. In principle, it can be sprayed onto a single-component varnish on an existing two-component varnish. The other way around, the two-component paint does not last on the surface.

Adjust viscosity

For adjusting the viscosity, there are special measuring cups that work on a simple principle. The funnel-shaped cups have a hole at the bottom. During the closing of the hole, the ready-mixed synthetic resin paint is filled into the measuring cup. After opening the hole, the time it takes for the paint to completely run out of the cup is measured.

Most manufacturers quote the period of best viscosity on their products. As a guideline, the synthetic resin paint should be completely drained after about thirty seconds. A good preparation to eliminate unevenly distributed suspended matter in the synthetic resin paint is the sieving during filling. For this purpose, a piece of nylon stocking is suitable, which is pulled over the filling opening of the paint tank.

Spray pressure and application method

The ideal spray pressure is between 3 and 3, 5 bar. With this pressure, a reliable and uniform coating application from about twenty centimeters spray removal is achieved. The outside temperature should be between 18 and 24 degrees Celsius.

Switch on the spraying before reaching the area to be painted and stop only after leaving. This prevents uneven application thickness from being applied. In principle spray from outside to inside and work overlappingly "wet on wet". Multiple thin layers produce a better result than a few thick orders.

Tips & Tricks

To assess the correct viscosity setting, examine the spray result on a sample surface. When crater-shaped orange peel forms, it needs to be diluted more. If running noses form, you should thicken the synthetic resin paint.

Video Board: Mixing Epoxies for Spray Painting